Question Which of the following is true? Answers It is safe to drive on a tire that is missing one or two lug nuts. A cracked lock ring on a rim is safe if you are not driving faster than 55 mph. A missing clamp on a rim is dangerous and should be corrected. Explanation Missing clamps, spacers, studs, or lugs are dangerous, as are mismatched, bent, or cracked lock rings. Be sure your tires and rims are in good condition before operating your commercial motor vehicle. Take a FREE Practice Test Now This questions appears in the following tests: Oregon Knowledge Test Class A , California Knowledge Test Class B ,